{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-l8108w8y","versions":[{"created_at":"2026-06-10T22:57:01Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"8290f5668234e1c432a6247674267dc87e9744926bf2294ea17b983f90e4f0da","version":9},{"created_at":"2026-06-10T19:02:33Z","element_count":74,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"dc505744c546b20b03f18ba428128ac0a4f458e9b5d3fa331b4d46b7ee960914","version":2}]}